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Background  Coxiella burnetii causes the common worldwide zoonotic infection, Q fever. It has been previously suggested that patients who had recovered from acute Q fever (whether symptomatic or otherwise) may be at increased risk of ischaemic heart disease. We undertook this study to determine if past infection with  Coxiella burnetii , the aetiological agent of Q fever, is a risk factor for the subsequent development of ischaemic heart disease.    Methods  A nested case-control study within the  Prospective Epidemiological Study of Myocardial Infarction  (PRIME). The PRIME study is a cohort study of 10,593 middle-aged men undertaken in France and Northern Ireland in the 1990s. A total of 335 incident cases of ischaemic heart disease (IHD) were identified and each case was matched to 2 IHD free controls. Q fever seropositivity was determined using a commercial IgG ELISA method.    Results  Seroprevalence of Q fever in the controls from Northern Ireland and France were 7.8% and 9.0% respectively. No association was seen between seropositivity and age, smoking, lipid levels, or inflammatory markers. The unadjusted odds ratio (95% CI) for Q fever seropositivity in cases compared to controls was 0.95 (0.59, 1.57). The relationship was substantially unaltered following adjustment for cardiovascular risk factors and potential confounders.    Conclusion  Serological evidence of past infection with  C. burnetii  was not found to be associated with an increased risk of IHD.

Lack of association between serological evidence of past Coxiella burnetii infection and incident ischaemic heart disease: nested case-control study